Tensioning means.



. G. L. DAVID.

TENSIONING'MEANS. APPLIUATION IILED MAB. 9; 119,09.

993.963, Patented May 3o, 1911.

zig 7%@ ,gf

ca., wAsmNanm. md.

C. L. DAVID.

v TENSIONING MEANS.

APPLICATION FILED MAB. 9, 1909. 993,963., Patented May 3o, 1911.

2 SHEETS-SHEET 2.

@fm1 11M/'- 1HE Nomzls PETERS ca, wAsHlNaroN, D. a:A

CHARLES LUCIEN DAVID, OF RHEIMS, FRANCE.

TENSIONING MEANS.

Specicaton of Letters Patent.

Patented May 30, 1911.

Application led March 9, 1909. Serial No. 482,314.

To aZZ whom it may concern Be itknown that I, CHARLES LUGIEN DAVID,municipal councilor of the town of Rheims, a citizen of the FrenchRepublic, residing at l() Rue de Trianon, Rheims, Marne, France, haveinvented certain new and useful Improvements in or Relating toTensioning Means, of which the following is a specification.

This invention relates to tensioning devices such, for instance, asthose provided generally on looms, the object of the invention, broadlystated, comprehending the production of an effective device of the typespecified, for keeping a constant tension on material unwound orunrolled from a spool or bobbin.

The following description and the accompanying drawings, which show astructural embodiment of the invention in its application to the warpbeam of a weaving loom, will enable the invention to be clearlyunderstood.

In the drawings, Figure l is a side elevation of the invention. Fig. 2is the corresponding end view.

In said drawings, a indicates the warp beam, Z) the warp to be unrolled,and c the usual whip roll for guiding the warp. The invention includes,in addition, a pair of two-armed levers Z and a lever g keyed to a shaftg, which in its turn is journaled in the frame, (not shown). The ends ofthe vertical arms of the levers Z serve as bearings for the trunnions ofthe whip roll, and those of the horizontal arms as bearings for a roll0. One or more springs m act on lateral arms g2 secured to the shaft g,so as to impart to the system of levers a tendency toward anti-clockwisemovement.

The spindle a upon which the bea-m a is mounted has keyed thereto asprocket wheel z' connected by a chain z" with a smaller sprocket wheelZ2 keyed to a spindle 3 located below and parallel with spindle a. Tothe second spindle are also keyed a ratchet wheel and a drum n aroundwhich latter passes a brake band 0, as hereinafter described. Theratchet is engaged by a depending pawl j formed upon a lever j pivotedat one end upon a pin jz set into the frame, the other end of said leverbeing provided with a pair of lateral pins 722 and 7a2 extending inopposite directions, the attachment of the pins being preferably such asto permit of their adjustment. Levers g and j are joined by a verticalrod 7a composed of two sections whose overlapping ends have abolt-and-slot connection with each other, thereby permitting the lengthof the rod to be adjusted. The free end of the upper rod section isconnected by a pin to that of the lever g, while the corresponding endof the lower section has a slot Z2 formed thereon for the reception ofthe pin 7:2. There is also pivoted at one end to the pin jg a brakelever y) to which, adjacent the pivot, the ends of the band 0 aresecured, the other end of the lever being formed with a slot p intowhich the pin p2 extends.

The operation of the invention is as follows: The tension exerted uponthe warp is transmitted through the same tothe beam a,-

`said beam, however, is normally held against rotation, owing to itschain-and-sprocket connection with the spindle 3 to which the ratchet y'is keyed, the latter being engaged by the pawl jm. The effect of suchtension, therefore, is to cause the two-armed levers Z and their shaft gto turn in a clockwise direction, against the action of springs m.During this movement, the lever g secured to said shaft raises theconnecting rod 7c, which latter in turn raises the pawl-lever j throughthe medium of its slot-and-pin connection 102 therewith. Pawl j isthereby disengaged from the ratchet, whereupon the warp beam is free torotate and to pay out the warp. As the pawl-lever swings upwardly, itspin p2 is moved into contact with the upper end of the slot p in thebrake lever 29, this lever being then raised in turn. The movement ofthe brake lever tightens the band 0 around the drum n, and thus checksthe otherwise excessive speed of rotation of the warp beam.

Further description of the invention is deemed unnecessary in view ofthe foregoing, it being understood that there is no intention of itsbeing limited to the exact construction shown and described, sincemodifications and changes may obviously be made within the scope of theappended claims.

/Vhat is claimed is:

l. In a let-off mechanism, the combination of a warp beam; a whip roll;a spindle connected with said bea-m for movement in unison therewith; astop mechanism and a brake mechanism connected to said spindle forcontrolling the movements thereof; and a common means operated by themovement of the whip roll for successively releasing said stop mechanismand operating said brake mechanism.

2. In a let-off mechanism7 the combination of a warp beam; a whip roll;a spindle connected with said beam for movement in unison therewith; astop mechanism and a brake mechanism connected to said spindle forcontrolling the movements thereof; a rod connected with the whip rolland with one element of the stop mechanism, for operating the latter;and an operating connection between said element and one element of thebrake mechanism.

3. In a let-off mechanism7 the combination of a warp beam; a whip roll;a spindle connected with said beam for movement in unison therewith; astop mechanism and a brake mechanism connected to said spindle forcontrolling the movements thereof and including an operating lever; averticallymovable rod having its upper end connected with the whip roll,and its lower end slotted; a pin carried by the lever of the first-namedmechanism and arranged for engagement in the slot in said rod; and a pincarried by the lever of the secondnamed mechanism and arranged forengagement in a slot in the first-named lever.

In testimony whereof I have hereunto set my hand in presence of twosubscribing witnesses.

CHARLES LUCIEN DAVID.

Witnesses:

H. C. CoXE, i AMAND MARX.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, I). C.

